I am not a designer or a programmer, I am simply trying to figure out what might be causing a problem with Minecraft for my son. I apologise if this is not the appropriate place for this, but if someone could at least point me in the right direction I would really appreciate it.

My son has been playing Minecraft for a very long time and is quite knowledgable, but for the past couple of weeks whenever he plays Minecraft, it simply quits. Sometimes he he gets an error message and the "Do you want to quit?" question, but other times it just vanishes. And it's happening on all the servers that he uses, and in single-player.

Each time, there is a Java error report generated. They aren't all exactly the same, but here is an example of one below.

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